import {
  document,
	window,
	HTMLCanvasElement,
	requestAnimationFrame,
	cancelAnimationFrame,
core,
	Event,
  Event0
} from "dhtml-weixin"
import * as THREE from './three/Three';
import Stats from 'three/addons/libs/stats.module.js';
var requestId
Page({
  onShareAppMessage(){
    return getApp().onShare()
  },
  onShareTimeline(){
     return {title:"ThreeX 2.0"}
  },
	onUnload() {
		cancelAnimationFrame(requestId, this.canvas)
		this.worker && this.worker.terminate()
if(this.canvas) this.canvas = null
		setTimeout(() => {
			if (this.renderer instanceof THREE.WebGLRenderer) {
				this.renderer.dispose()
				this.renderer.forceContextLoss()
				this.renderer.context = null
				this.renderer.domElement = null
				this.renderer = null
			}
		}, 0)
	},
  webgl_touch(e){
		const web_e = (window.platform=="devtools"?Event:Event0).fix(e)
		this.canvas.dispatchEvent(web_e)
  },
  onLoad() {
		document.createElementAsync("canvas", "webgl2").then(canvas => {
      this.canvas = canvas
      this.body_load(canvas).then()
    })
  },
  async body_load(canvas3d) {	

  let stats;
  let camera, scene, raycaster, renderer;

  let theta = 0;
  let INTERSECTED;

  const pointer = new THREE.Vector2();
  const radius = 25;
  const frustumSize = 50;

  init();
  animate();

  function init() {

    const aspect = window.innerWidth / window.innerHeight;
    camera = new THREE.OrthographicCamera( frustumSize * aspect / - 2, frustumSize * aspect / 2, frustumSize / 2, frustumSize / - 2, 0.1, 100 );

    scene = new THREE.Scene();
    scene.background = new THREE.Color( 0xf0f0f0 );

    const light = new THREE.DirectionalLight( 0xffffff, 3 );
    light.position.set( 1, 1, 1 ).normalize();
    scene.add( light );

    const geometry = new THREE.BoxGeometry();

    for ( let i = 0; i < 2000; i ++ ) {

      const object = new THREE.Mesh( geometry, new THREE.MeshLambertMaterial( { color: Math.random() * 0xffffff } ) );

      object.position.x = Math.random() * 40 - 20;
      object.position.y = Math.random() * 40 - 20;
      object.position.z = Math.random() * 40 - 20;

      object.rotation.x = Math.random() * 2 * Math.PI;
      object.rotation.y = Math.random() * 2 * Math.PI;
      object.rotation.z = Math.random() * 2 * Math.PI;

      object.scale.x = Math.random() + 0.5;
      object.scale.y = Math.random() + 0.5;
      object.scale.z = Math.random() + 0.5;

      scene.add( object );

    }

    raycaster = new THREE.Raycaster();

    renderer = new THREE.WebGLRenderer( { antialias: true } );
    renderer.setPixelRatio( window.devicePixelRatio );
    renderer.setSize( window.innerWidth, window.innerHeight );
    document.body.appendChild( renderer.domElement );

    stats = new Stats();
    document.body.appendChild( stats.dom );

    document.addEventListener( 'pointermove', onPointerMove );

    //

    window.addEventListener( 'resize', onWindowResize );

  }

  function onWindowResize() {

    const aspect = window.innerWidth / window.innerHeight;

    camera.left = - frustumSize * aspect / 2;
    camera.right = frustumSize * aspect / 2;
    camera.top = frustumSize / 2;
    camera.bottom = - frustumSize / 2;

    camera.updateProjectionMatrix();

    renderer.setSize( window.innerWidth, window.innerHeight );

  }

  function onPointerMove( event ) {

    pointer.x = ( event.clientX / window.innerWidth ) * 2 - 1;
    pointer.y = - ( event.clientY / window.innerHeight ) * 2 + 1;

  }

  //

  function animate() {

    requestId = requestAnimationFrame( animate );

    render();
    stats.update();

  }

  function render() {

    theta += 0.1;

    camera.position.x = radius * Math.sin( THREE.MathUtils.degToRad( theta ) );
    camera.position.y = radius * Math.sin( THREE.MathUtils.degToRad( theta ) );
    camera.position.z = radius * Math.cos( THREE.MathUtils.degToRad( theta ) );
    camera.lookAt( scene.position );

    camera.updateMatrixWorld();

    // find intersections

    raycaster.setFromCamera( pointer, camera );

    const intersects = raycaster.intersectObjects( scene.children, false );

    if ( intersects.length > 0 ) {

      if ( INTERSECTED != intersects[ 0 ].object ) {

        if ( INTERSECTED ) INTERSECTED.material.emissive.setHex( INTERSECTED.currentHex );

        INTERSECTED = intersects[ 0 ].object;
        INTERSECTED.currentHex = INTERSECTED.material.emissive.getHex();
        INTERSECTED.material.emissive.setHex( 0xff0000 );

      }

    } else {

      if ( INTERSECTED ) INTERSECTED.material.emissive.setHex( INTERSECTED.currentHex );

      INTERSECTED = null;

    }

    renderer.render( scene, camera );

  }

  }
})